/usr/share/intel2gas/m2g/manypublics.syntax is in intel2gas 1.3.3-16+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | <text>
.global <text>
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<text>, <manypublics>
.global <text>\n<manypublics>
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